US3458760A - Writing head producing a jet of ink - Google Patents

Writing head producing a jet of ink Download PDF

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Publication number
US3458760A
US3458760A US651456A US3458760DA US3458760A US 3458760 A US3458760 A US 3458760A US 651456 A US651456 A US 651456A US 3458760D A US3458760D A US 3458760DA US 3458760 A US3458760 A US 3458760A
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US
United States
Prior art keywords
jet
ink
tube
nozzle
parts
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US651456A
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English (en)
Inventor
Enzo Ascoli
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Paillard SA
Original Assignee
Paillard SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Paillard SA filed Critical Paillard SA
Application granted granted Critical
Publication of US3458760A publication Critical patent/US3458760A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet

Definitions

  • Writing heads producing a jet of ink which include a body carrying a tube constituting a nozzle for the jet of ink and jet-deflecting electrodes located to either side of the axis of said tube.
  • the tube constituting the nozzle for the ink and the deflecting electrodes are carried by a support, but are exposed to shocks through possible impact against other objects and also to the deposit of dust.
  • These different parts the geometrical size of which must be perfectly unvariable so as to obtain a uniform writing, are thus subject to deformation or else their outer outline is liable to be modified by a deposit of particles adhering to said parts.
  • the present invention has for its object an eflicient shielding of the delicate parts of such a writing head and more specifically it covers a writing head including a body carrying a tube constituting a nozzle projecting the jet of ink and jet deflecting electrodes extending to either side of the tube axis.
  • said tube and deflecting electrodes are fitted in a support of a generally cylindrical shape provided with an output port and with at least one further port through which the air carried along by the jet of ink through the output port is replaced by fresh incoming air.
  • FIG. 1 is a longitudinal sectional view of said embodiment.
  • FIGS. 2 and 3 are transverse cross-sections through lines IIII and III--III of FIG. 1.
  • the reading head illustrated includes a metal body 1 of which the cylindrical section 2 serves as a support for a coaxial bell-shaped member 3 of insulating material. Said bell-shaped member is merely slid over said cylindrical section 2 which is provided with longitudinal slots 4 adapted to increase its elasticity.
  • the bell-shaped member 3 may be obtained through molding and it includes a transverse partition 5 provided with an annular series of openings 6 and rigid with a sleeve-shaped coaxial member 7.
  • Said sleeve-shaped member 7 forms a unit with the bell-shaped member 3 and may be cast for instance therewith out of synthetic material such as that sold under the registered trade name nylon.
  • the sleeve 7 serves as a support for a metal annulus 8 inside which is set a tube 9 forming a nozzle projecting the jet of ink. The ink is fed to the tube 9 through a yielding pipe 10.
  • the body 1 carries in its medial section a tansverse annular partition or wall 11 provided in its middle and in registery with the tube 9 with an opening 12 the edges of which are sharp.
  • the end of the body 1 opposed to its cylindrical section 2 forms longitudinal projections 13, 14, 15, 16 of which the inwardly facing surfaces are tapped at 17. Said tappings 17 allow screwing inside the body 1 an outwardly projecting terminal metal member 18 adapted to clamp in position outside the body 1 a metal ring 19, a securing plug 20 and two rings of insulating material 21 and 22 in contacting relationship with a peripheral shoulder 23 provided on the outer surface of the body 1.
  • the two rings 21 and 22 serve as carriers for four plates 24, 24', 25, 25' forming the electrodes deflecting the jet of ink projected out of the tube 9 through the opening 12 in the annular partition 11.
  • the surfaces facing each other on the rings 21 and 22 are provided with grooves 21 and 22' respectively, which serve as guides for the electrode plates.
  • the plates 24 and 24 are provided each with two notches, a, whereas the plates 25 and 25 show each two notches b.
  • the plates 24, 24, 25, 25 are furthermore given substantially the same shape and are arranged pairwise at right angles and in opposed relationship. Said arrangement allows interengaging said plates without any electric contact between them, the plates 24, 24' lying in two vertical parallel planes and the plates 25, 25 in two horizontal planes.
  • the two rings 21 and 22 are spaced with reference to the path followed by the jet of ink by the projections 13 to 16 on the support 2 and also by the intermediate projections 26 (FIG. 3) inserted between the former projections.
  • the jet of ink is protected to a maximum extent against any parasitic action ascribable to the static loads possibly carried by the insulating parts.
  • the sole parts of the jet of ink which might be subjected to some slight action of the static loads carried by the rings 20 and 22 extend between the opening 12 and the entrance of the jet into the passage defined by the electrodes and also between the output of said passage and entrance of the opening 27 defined by the terminal metal member 18.
  • the voltage applied to the tube 9 is transmitted either by the conductive ink or else by a metal lead which may, as a matter of fact, be inserted inside the yielding pipe 10.
  • the carrier parts made of metal that is the parts 2, 20 and 18 are subjected to the same voltage as the support carrying the surface to be written over. Consequently, the electric field between the opening 27 in the terminal member 18 and said surface showing the point of impact for the jet of ink is equal to zero and the path of the jet of ink can therefore no longer be modified between the output of the writing head and said point of impact onto the writing surface.
  • the extremely small ink droplets forming the secondary jet escape within a cone the apical angle of which is large and are arrested by the partition 11.
  • the latter is polished and the edge of the opening 12 therein is very sharp so that the droplets forming the secondary jet cannot collect on such a sharp cutting edge by reason of the surface pressure of the ink droplets.
  • the sharp edge of the opening 12 merges into the surface of the partition 11 facing the tube 9 along a convex annular surface 11a which is also polished so as to further the coalescence of the extremely small ink droplets which may settle on said annular surface.
  • Said droplets form thus a continuous annular sheet of ink which flows steadily towards an output port opening into the depending tube 28 as furthered by a vertical groove 29 extending between the convex surface 11a and said output port.
  • said head shows numerous advantages over those proposed hitherto.
  • said head is of a simple structure and shows a high rigidity. Furthermore, it forms a closed unit and the weak sections of said head are protected against shocks and the like objectionable actions.
  • the openings 6 formed in the partition allow air to enter the writing head so as to replace the air escaping through the opening 27 and which is carried along by the moving jet of ink.
  • the air pressure inside the head remains substantially constant which is essential with a view to obtaining a clean writing.
  • the system of carrier parts is rigid with the securing lug 20 as provided by the mere screwing of the terminal member 18 inside the threads 17 cut in the longitudinal projections 13 to 16.
  • the terminal member 18 is provided along its outer edge with a slot 29' adapted to be engaged by a screw-driver.
  • the insulating bell-shaped member 3 rigid with the annulus 8 and 4 .tube 9 may be removed through a mere sliding over the cylindrical section 2 of the body 1 which allows inspecting and cleaning easily said tube 9.
  • a writing head comprising a nozzle adapted to project a jet of ink and jet-deflecting electrodes extending toeither side of the tube axis, the provision of a generally cylindrical support enclosing said tube and electrodes and provided with an output opening for the jet of ink passing out of the nozzle and between the electrodes and for the air carried along by said jet and with at least one input opening located ahead of the nozzle output and forming a passage for the external air replacing that carried along by the jet of ink.
  • the support includes insulating parts carrying the electrodes, a metal part rigid with said insulating parts and shielding the output end of the nozzle against any electric charge carried by said insulating parts, a cylindrical extension of said metal part surrounding coaxially the nozzle, an insulating bell-shaped member fitted coaxially with a sliding fit on said cylindrical extension, a transverse centrally apertured web rigid with the inner surface of said bell-shaped member and an annular dished member carried by said web and surrounding the nozzle, the outer end of which dished member surrounds the nozzle in proximity therewith to shield the latter against any electric charges carried by the bell-shaped member and web, the web being provided with the input openings.

Landscapes

  • Particle Formation And Scattering Control In Inkjet Printers (AREA)
  • Ink Jet (AREA)
  • Facsimile Heads (AREA)
US651456A 1967-02-13 1967-07-06 Writing head producing a jet of ink Expired - Lifetime US3458760A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH208667A CH452559A (fr) 1967-02-13 1967-02-13 Tête d'écriture à jet d'encre

Publications (1)

Publication Number Publication Date
US3458760A true US3458760A (en) 1969-07-29

Family

ID=4225561

Family Applications (1)

Application Number Title Priority Date Filing Date
US651456A Expired - Lifetime US3458760A (en) 1967-02-13 1967-07-06 Writing head producing a jet of ink

Country Status (10)

Country Link
US (1) US3458760A (de)
JP (1) JPS4813845B1 (de)
AT (1) AT271043B (de)
CH (1) CH452559A (de)
DE (1) DE1673979B1 (de)
ES (1) ES349588A1 (de)
FR (1) FR1552426A (de)
GB (1) GB1168570A (de)
NL (1) NL6801768A (de)
SE (1) SE324908B (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3735199A (en) * 1971-01-06 1973-05-22 Paillard Sa Supply device for an outlet nozzle in an ink jet writing method
US3787880A (en) * 1971-08-24 1974-01-22 Siemens Ag Ink jet printer interchangeable recording head

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2600129A (en) * 1948-07-17 1952-06-10 Charles H Richards Apparatus for producing a stream of electrically charged multimolecular particles
US3060429A (en) * 1958-05-16 1962-10-23 Certificate of correction
US3275239A (en) * 1962-07-17 1966-09-27 Kurt M Oesterle Apparatus for the electrostatic precipitation of coating material
US3278940A (en) * 1962-10-08 1966-10-11 Paillard Sa Electrostatic emitter for writing with ink jet

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH356477A (fr) * 1959-10-12 1961-08-31 Paillard Sa Procédé d'écriture au moyen d'un jet de matière dirigé sur une surface, et dispositif pour la mise en oeuvre de ce procédé

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2600129A (en) * 1948-07-17 1952-06-10 Charles H Richards Apparatus for producing a stream of electrically charged multimolecular particles
US3060429A (en) * 1958-05-16 1962-10-23 Certificate of correction
US3275239A (en) * 1962-07-17 1966-09-27 Kurt M Oesterle Apparatus for the electrostatic precipitation of coating material
US3278940A (en) * 1962-10-08 1966-10-11 Paillard Sa Electrostatic emitter for writing with ink jet

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3735199A (en) * 1971-01-06 1973-05-22 Paillard Sa Supply device for an outlet nozzle in an ink jet writing method
US3787880A (en) * 1971-08-24 1974-01-22 Siemens Ag Ink jet printer interchangeable recording head

Also Published As

Publication number Publication date
FR1552426A (de) 1969-01-03
DE1673979B1 (de) 1971-12-02
CH452559A (fr) 1968-03-15
AT271043B (de) 1969-05-27
GB1168570A (en) 1969-10-29
NL6801768A (de) 1968-08-14
ES349588A1 (es) 1969-04-01
SE324908B (de) 1970-06-15
JPS4813845B1 (de) 1973-05-01

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